Inverted polygon renderer: update SIP

Author: Hugo Mercier

python/core/symbology-ng/qgsinvertedpolygonrenderer.sip

@@ -67,4 +67,14 @@ class QgsInvertedPolygonRenderer : public QgsFeatureRendererV2
   /** @returns the current embedded renderer
    */
   const QgsFeatureRendererV2* embeddedRenderer() const;
+  /** @returns true if the geometries are to be preprocessed (merged with an union) before rendering.*/
+
+  bool preprocessingEnabled() const;
+  /** 
+      @param enabled enables or disables the preprocessing.
+      When enabled, geometries will be merged with an union before being rendered.
+      It allows to fix some rendering artefacts (when rendering overlapping polygons for instance).
+      This will involve some CPU-demanding computations and is thus disabled by default.
+  */
+  void setPreprocessingEnabled( bool enabled );
 };